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21 Jan 2019, 05:18
Kudos
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
75%
(hard)
Question Stats:
59% (02:30) correct
41%
(02:42)
wrong
based on 782
sessions
History
Date
Time
Result
Not Attempted Yet
Individual pyrrole molecules readily join together into larger molecules called polypyrroles. If polypyrroles form from pyrrole in the presence of zeolites, they do so by attaching to the zeolite either in lumps on the outer surface of the zeolite or in delicate chains within the zeolite's inner channels. When zeolite changes color from yellow to black, it means that on or in that zeolite polypyrroles have formed from pyrrole. Yellow zeolite free of any pyrrole was submerged in dissolved pyrrole. The zeolite, turned black even though no polypyrroles formed on its outer surface.
If the statements above are true, which one of the following must on the basis of them be true?
(A) Polypyrroles had already formed on or in the zeolite before it was submerged.
(B) Lumps of polypyrrole attached to the zeolite were responsible for its color change.
(C) At least some of the pyrrole in which the zeolite was submerged formed polypyrrole chains.
(D) None of the pyrrole in which the zeolite was submerged attached itself to the zeolite.
(E) Little, if any, of the pyrrole in which the zeolite was submerged reached the zeolite's inner channels.
If the statements above are true, which one of the following must on the basis of them be true?
(A) Polypyrroles had already formed on or in the zeolite before it was submerged.
(B) Lumps of polypyrrole attached to the zeolite were responsible for its color change.
(C) At least some of the pyrrole in which the zeolite was submerged formed polypyrrole chains.
(D) None of the pyrrole in which the zeolite was submerged attached itself to the zeolite.
(E) Little, if any, of the pyrrole in which the zeolite was submerged reached the zeolite's inner channels.
28 Jan 2019, 10:32
Kudos
Bookmarks
Bunuel
My reasoning if it helps anyone:
The passage states that pyrrole molecules attach themselves on/in a zeolites to form a new compound called polypyrroles. A zeolite that has changed colors, means that there is some polypyrroles attached to it (either inside or outside). If a zeolite turns black, but there is no polypyrroles on the outside, it means it must have formed delicate chains within the zeolite's inner channels.
A) If this was true the zeolite would be black. Incorrect
B) The passage says no polypyrroles formed on the outside.
C) Correct, this MUST be true because there are only two ways for a zeolite to turn black. If it was not because of lumps of polypyrroles on the outside, it must be because of polypyrroles chains.
D) We know the zeolite turned black so this cannot be true
E) We know that the pyrrole must have reached the inner channels. That's the only way the zeolite turned black.
24 Sep 2020, 10:03
Kudos
Bookmarks
From Kaplan LSAT explanation
"Despite the technical jargon, this stimulus is actually made up of a bunch of formal logic
statements. Take the third sentence: If X (yellow to black), then either Y (polypyrroles form
on zeolites) or Z (polypyrroles form in zeolites). The last sentence tells us that X occurred
(yellow to black), but Y didn’t. From this we can deduce that Z must have occurred:
polypyrroles formed from pyrroles inside the zeolite. The second sentence tells us that
when polypyrroles form inside the zeolites, they form in delicate chains. Therefore, we can
infer (C): some of the pyrroles in which the zeolite was submerged formed into
polypyrrole chains.
(A) The stimulus says that the zeolite was “free of any pyrrole” before it was submerged,
so (A) is impossible.
(B) Since the polypyrroles must have formed in and not on the zeolite, they must have
been formed as chains, not lumps.
(D) There’s no reason why some pyrrole couldn’t attach itself to the zeolite; all we know is
that no polypyrroles formed from pyrroles on the zeolite.
(E) Since the polypyrroles formed inside the zeolite, we know some pyrroles reached the
zeolite’s inner channels; we have absolutely no reason to infer that only a “little” did so."
"Despite the technical jargon, this stimulus is actually made up of a bunch of formal logic
statements. Take the third sentence: If X (yellow to black), then either Y (polypyrroles form
on zeolites) or Z (polypyrroles form in zeolites). The last sentence tells us that X occurred
(yellow to black), but Y didn’t. From this we can deduce that Z must have occurred:
polypyrroles formed from pyrroles inside the zeolite. The second sentence tells us that
when polypyrroles form inside the zeolites, they form in delicate chains. Therefore, we can
infer (C): some of the pyrroles in which the zeolite was submerged formed into
polypyrrole chains.
(A) The stimulus says that the zeolite was “free of any pyrrole” before it was submerged,
so (A) is impossible.
(B) Since the polypyrroles must have formed in and not on the zeolite, they must have
been formed as chains, not lumps.
(D) There’s no reason why some pyrrole couldn’t attach itself to the zeolite; all we know is
that no polypyrroles formed from pyrroles on the zeolite.
(E) Since the polypyrroles formed inside the zeolite, we know some pyrroles reached the
zeolite’s inner channels; we have absolutely no reason to infer that only a “little” did so."
